The green ash and white ash – species from America that are different from the European ash trees found in Britain – appear to be resistant to the Chalara fraxinea fungus which is now threatening more than 80 million trees in this country, research has found.

Scientists believe that it may be possible to create a new type of European ash tree that is resilient to the infection by breeding them with their resistant American counterparts and other species from Asia.

“It might make sense to plant American ash in Britain as a replacement for British ash species, but on the other hand, American ash species are susceptible to the emerald ash borer, a beetle from Asia.”